just something i found. can it work on our supras?

[cmdeshon]

once again, well said.

the main reason i dont like them is that it really sucks when the water lines leak under the intake manifold. after fixing a very slow weeping drip on a few different occasions i just decided to cap them off underneath. i cant speak as to how it has affected my milage but its not leaking anymore.

also a lot easier to assemble the intake manifolds IMO.

[Donn29]

I've never hooked them back up, once I had them off. One of those silly N/A mods, in my mind. "Oooh, I gained .5 hp!" Also, I have driven the car in 0*F weather without issue.

[rce311]

I read that whole post on that mazda forum and OH-MY-GOD! What a bunch of TOOLS! Thank God we don't sound like that!

Reminds me of a bunch of 12-year-olds gathering around the engine bay, "yeah man! That's an awesome idea!"

Of course it is. Auto manufactures spend millions in R&D every year to add dumb shit to the car for no reason/performance/economy. Lol.

I love shit like that. Makes me feel like a friggin einstein!

[SidewayzMKII]

I just deleted this on my car. I simply put caps on the in & out on the throttle body Then made a block off plate for the bottom. Super simple I'll get some pics tomorrow if i think about it.

[StanS]

There's loads of turbulence in the air passing thru the tb due to the cross sectional shape change just before the tb in a stock setup. This mod has been reported on this forum many, many times without incident. I did this mod more than 100Kmi ago without any problems. There may be some very small power gain if used in conjunction with cai.

[4SFED]

Makes me feel like a friggin einstein!

Alfred? Is that you?

[hxckid213]

will do this. also because the tubes are rusted dont want any pieces of metal going all over.

[mk2 supra]

Unless your intercooler is VERY efficient, the air temp going through the TB (when boosting) is higher than coolant temp. The velocity of forced air also isn't going to be as effected by surface temp because the other forces acting on it are much higher. A heated throttle body is still better, especially since you aren't boosting all the time, but it doesn't make as much difference as in an NA car. Still, the only benefit to this mod is simplicity

VERRRRRRYY UNTRUE...... I have logs of my dsm on Speed density, the Intake Air Temp sensor inches before the throttle body, and even with the shittiest ebay intercooler on a 100 degree day, my intake temps hit a peak of 155* when coolant was 200... and now that I have a reputable street intercooler,(ie not crap) my charge temps usually stay the same as ambient, the most Ive seen them climb is 12*.
This coolant bypass is one of those "free mods" to get all the power you can...similar to blocking off the egr. Although not exactly ground breaking power, it does help keep your air cool with a cold air intake and is worth doing from a performance reason.
and just to show Im not BSing... Heres a log sample, 20 psi. The IAT is Intake Air Temp

RPM Deg IAT WBo2 AFR PSIest MAP TPS Knock Coolant
6250 11 53 11.3 10.8 19.7 20.3 100 0 174
6303 12 53 11.2 10.8 21.1 20.1 100 0 174
6399 12.4 53 11.2 10.8 20.8 21.5 100 0 174
6454 12.4 53 11.2 10.8 20.6 21.3 100 0 174
6545 12.4 53 11.1 10.8 20.6 19.4 100 0 174

[lechner]

Even if your intercooled intake air temp is lower than coolant temperature (and I stand corrected on that), it doesn't change the fact that the ideal situation is still cool dense intake air travelling quickly over a heated surface. A heated throttle body is still better because the air moves over it quicker and with less turbulence and isn't there long enough to heat up. A cooler throttle body induces turbulence as it slows the flow of air more along the edges than in the center, resulting in less air getting into the cylinders.

This coolant bypass is one of those "free mods" to get all the power you can...similar to blocking off the egr.

Ironic you would draw that true analogy, since free power by blocking the egr is also a myth. Properly functioning egr is closed at full throttle, so there are no acceleration gains from blocking it. It increases fuel mileage under cruise conditions by burning unspent fuel you were about to throw away, all without hurting power when you want it, so why block it off (unless it no longer functions correctly)?
Both of these mods reduce functionality of the system in favor of a cleaner engine bay, and have no other purpose.

[Donn29]

I think there is a slight gain to be had from not having the egr cooler, or a tube that is heated from the exhaust pressure, etc. Just the same as removing the coolant lines. So not much of a gain really.